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Related Concept Videos

Mechanical Characteristics of Steel01:18

Mechanical Characteristics of Steel

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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
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Microcracking in Concrete01:20

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Properties of Transition Metals02:58

Properties of Transition Metals

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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Microstructure-Property Correlation and Its Evolution during Aging in an Al4.4Co26Cr19Fe18Ni27Ti5.6 High-Entropy

Florian Biermair1, Francisca Mendez-Martin2, Vsevolod I Razumovskiy1

  • 1Materials Center Leoben Forschung GmbH, Roseggerstraße 12, 8700 Leoben, Austria.

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Summary

Heat treatment significantly impacts the microstructure and mechanical properties of high-entropy alloys (HEAs). This study reveals how aging affects phase evolution and strengthening mechanisms in a specific HEA, offering insights for high-temperature applications.

Keywords:
characterizationcompositionally complex alloyprecipitation strengtheningsolid solution strengtheningyield strength prediction

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Area of Science:

  • Materials Science
  • Metallurgy
  • Physical Chemistry

Background:

  • High-entropy alloys (HEAs) are crucial for high-temperature applications due to their mechanical properties.
  • Understanding heat treatment effects is vital for optimizing HEA performance.
  • Limited data exists on heat treatment's influence on HEA microstructure and properties.

Purpose of the Study:

  • Investigate the impact of heat treatment on the microstructure and mechanical performance of an AlCoCrFeNiTi HEA.
  • Analyze the temporal evolution of matrix and precipitates during aging.
  • Provide insights into strengthening mechanisms and phase evolution in HEAs.

Main Methods:

  • Scanning electron microscopy (SEM)
  • Transmission electron microscopy (TEM)
  • Atom probe tomography (APT)
  • Classical and ab-initio calculations for yield strength and critical resolved shear stress.

Main Results:

  • Detailed analysis of matrix and γ'-precipitates' chemical composition, crystallography, size, shape, and volume fraction.
  • Quantified yield strength evolution and contributions using advanced models.
  • Demonstrated promising mechanical properties for the investigated HEA.

Conclusions:

  • Heat treatment is a critical factor in tailoring HEA properties.
  • The study elucidates strengthening mechanisms and phase evolution during heat treatment.
  • Findings support the potential of this HEA for high-temperature applications.